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유한요소해석을 이용한 평면 응력을 받는 완전 고정된 판의 좌굴 판단 기준에 대한 연구
이오성(Ohseong Lee),이건민(Keonmin Lee),윤정노(Jeongroh Yoon),유구현(Guhyun Ryu) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Buckling is undesirable phenomenon in designing mechanical elements. In particular, thin plate has low resistance about buckling due to its geometrical shape. Therefore, engineers have to be carful during the design proccess. Many preceding research derived buckling theories for various boundary conditions, but the solution of buckling mode is not a finite sum and is complicate to applicate in practical cases. Also, since the mathmetical solution of fully clamped rectangular plate is much more complicate than simply supported plate, the need for intuitively usable criteria emerges. Therefore, this study aims to suggest a criterion for clamped plate buckling by using finite element analysis method. From the results of iterative simulations, a criterion with simple straight lines was derived. This criterion does not strictly follow the curve from iterations, but since the derived criterion is simple and easy to applicate, it is worth enough for designing a thin plate.
유한요소해석을 이용한 평면 응력을 받는 완전 고정된 판의 좌굴 판단 기준에 대한 연구
이오성(Ohseong Lee),이건민(Keonmin Lee),윤정노(Jeongroh Yoon),유구현(Guhyun Ryu) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
Buckling is undesirable phenomenon in designing mechanical elements. In particular, thin plate has low resistance about buckling due to its geometrical shape. Therefore, engineers have to be carful during the design proccess. Many preceding research derived buckling theories for various boundary conditions, but the solution of buckling mode is not a finite sum and is complicate to applicate in practical cases. Also, since the mathmetical solution of fully clamped rectangular plate is much more complicate than simply supported plate, the need for intuitively usable criteria emerges. Therefore, this study aims to suggest a criterion for clamped plate buckling by using finite element analysis method. From the results of iterative simulations, a criterion with simple straight lines was derived. This criterion does not strictly follow the curve from iterations, but since the derived criterion is simple and easy to applicate, it is worth enough for designing a thin plate.
UHPFRCC의 균열 발생 여부에 따른 전자파 차폐 성능 평가
이호진(Hojin Lee),최진석(Jinseok Choi),이오성(Ohseong Lee),윤영수(Youngsoo Yoon) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.3
In this study, the crack distribution and electromagnetic shielding characteristics of UHPFRCC before and after cracking were evaluated according to fiber combinations. After evaluating the mechanical and electrical properties of each combination, an electromagnetic shielding test of a non-cracked panel specimen was conducted. Subsequently, the panel specimen was subjected to a monotonic load or repeated load. In the case of the test specimen with a repetitive load, the crack length, crack area, and electromagnetic shielding were measured at each load stage. According to the experimental results, the incorporation of organic fiber decreased the compressive strength and density of UHPFRCC. In particular, the incorporation of carbon fibers adversely affected the tensile behavior owing to dispersibility problems. The hybrid fiber combination increased the electrical resistivity. However, the incorporation of carbon fibers improved electromagnetic shielding performance compared with the single incorporation of steel fibers. The fiber combination significantly affected the crack length and width than the crack area. In addition, as cracks occurred, the electromagnetic shielding performance of a test specimen showed an average decrease of up to 20%.
PSCAD/EMTDC를 이용한 태양광발전의 정상상태 운용특성 분석
손준호(Joonho Son),지성호(Seongho Ji),박오성(Ohseong Park),송석환(Seokhwan Song),이범태(Beomtae Lee),노대석(Daeseok Rho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
최근 국가정책에 의해서 대규모의 태양광 및 풍력이 배전계통에 도입 운용되고 있다. 그리나 태양광발전이 배전계통에 연계 운전되면서 전압품질/고조파 문제가 발생되고 있다. 이에 본 논문에서는 태양광전원이 배전계통에 연계 운전 시 발생되는 문제를 분석하기 위해서 배전계통의 대표적인 상용소프트웨어인 PSCAD/EMTDC를 이용하여 모델링을 수행하였다. 그리고 시뮬레이션을 통해 배전선로 위치에 따른 전압변동을 분석하여, 태양광전원이 배전선로에 연계된 경우의 수용가의 전압특성을 제시하고자 한다.